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This is showing how to do the brake booster and not the master cylinder and it is for a 1983 which is only 5 yrs older but basically the same procedure is performed on both the '83 vs. '88 models. You just have to go one step further to do mastercylinder but you remove the brake lines first and the proceed in removing it. Before you put master cylinder back on, you will have to bench it to insure all the air is removed so you won't get air into the brake system. https://www.youtube.com/watch?v=OUvBHnOh9ao
This video show a 2002 ranger but the bleeding proceder is the same. I hbope this helps with all your repairs. Jesus loves you, John 3:16-17 (KJV)
You can bleed the system all you want and STILL have the pedal go to floor unless the master cylinder was bench bled in a vice BEFORE it was put on the vehicle. ALWAYS bench bleed a master cylinder before you put it in service. If you don't, you'll never get the pedal off the floor.
two ways I do it first you can remove the master cylinder which is more work or my way is leave fluid cap on lines connected. Remove the two bolts attaching the cylinder to the booster and then pull the cylinder out of the way. Next go under the dash and you will find the bolts holding the booster to the firewall remove them then remove the booster sometimes you may have to tap the booster to break the hold then just reverse the procedure good luck Mike L.
sounds like the break booster or master cylinder. Also maybe a vacumm issue with the break booster make sure the line is hooked from the booster to the engine intake
Check your parking brake. if it goes down to the floor or does not hold, then your back brakes needs adjusted. bad master cylinders bleed off slowly to the floor while pushing on the brake pedal. If you need assistance on adjusting let me know.
Randy
Sounds like the brake booster has a hole in the diaphragm .. You should be able to pick up a used one fairly cheap and they are easy to change out. You don't need to undo any brake lines just remove the master cylinder and prop it out of the way.
did you hook the back blast valve back up to the booster mon........ also check the plastic valve in the line to the booster to make sure its working if that don;t fix it then either you have a bad booster or you put the wrong master cylinder on it cause the one for standard breaks? the hole in the end of the master cylinder isnt as deep and the one for power breaks
2 places to check 1. look at the rear wheel backing plates for moisture 2. pull the master cylinder back and look for fluid in the vacuum booster. if leaks at the rear its going to be rear wheel cylinders which will require replacing wheel cylinders and shoes. if the vacuum booster is full replace the master and booster.
it might be your master cylinder..."my brakes go out" is not the best description. if the pedal feels very soft, or goes all the way to the floor, then its probably the master cylinder. also, if you just had break work done, then its possible that not all the air go blead out of the system. if the breaks are hard to push, then your break booster may have a leak..
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